Assessment of the effect of quality factors on the assortment structure in poplar plantations

Abstract

Quality factors affecting the assortment quality structure in poplar plantations were researched on nine temporary sample plots in the period 1997-2004, from the aspect of the implementation of roundwood standards. Sample plots were selected depending on the factors, the effect of which was studied. The following factors were researched: clonal species, planting pattern, flood risk, pruning of branches, plantation position and age. The study was performed by the original methodology. Based on the study results, it is concluded that knots have the highest effect on the assortment quality structure in poplar plantations, regardless of the site and stand conditions. Their effect rises significantly with the increase of tree diameter. Also, the analyses show that the number of large and rotten knots on the tree trunk increases considerably with the older age. In the flooded area, the sweep of the lower part of the stem is more intensive and multiple curvatures are frequent on the trees growing immediately along the river, whereas curvature decreases with the distance from the river bank. Based on the study results, it is concluded that the percentage of best quality assortments is considerably reduced by the above wood defects

Relation between forest stand diversity and anticipated log quality in managed Central European forests

“…In middleaged stands, future timber production is improved by thinning treatments that influence the growth of individual trees (Pretzsch 2009). Several authors (Danilović 2008;Prka & Krpan 2010) have shown thinning may greatly improve final timber quality, as this changes the final habitus of individual trees, which improves log quality for a given tree (Prka 2012). In addition, species diversity may help increase forest productivity by promoting denser and more structurally complex canopies (Jucker et al 2015).…”

“…Stand assortment structure is influenced by a number of factors (Danilović 2008;Prka & Krpan 2010;Prka 2012). One of the main factors affecting the distribution of timber assortments in individual trees is the diversity of tree habitus (stem and crown shape; Prka 2012), which is largely influenced by forest structure.…”

Relation between selected indicators of forest stand diversity and quality of timber production in managed Central European forests

“…Stand assortment structure is influenced by a combination of several factors including site conditions (Danilović 2006), silvicultural measures (Danilović 2008;Prka, Krpan 2010), stand density, spatial distribution of trees, species composition (Liang et al 2007), and diversity of tree habitus (Prka 2012). The results of our analysis confirmed that the quality of timber production is a result of multiple relations because the explanatory power of the univariate linear regressions was low (the average significant correlation coefficients did not exceed 0.7, Fig.…”